var obj={
name:"geyao",
age:22
}
function Car(){
this.brand="Benz",
this.color="red",
this.size=18
}
Car.prototype={
age:18,
width:2.5
}
Object.prototype.sex="女"
var car=new Car()
for(var key in car){
console.log(key+'+'+car[key])
}运行结果
